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straight-line films and platinum


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I agree with William. Check these curves for FP4:

 

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<a href="http://home.att.net/~shipale/FP4_BTZS_curves.html">FP4 with PMK and pyrocatHD</a>

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Notice the PMK 10-20-500 results in a straight line curve whereas the standard PMK dilution 10-20-1000 has a significant shoulder. I think generally standard PMK is good for N- developments, not N+ and I think that's why AZO users (and pt/pd) have problems with standard PMK. I am using pyrocatHD for AZO.

 

Along those lines Sandy King's recent tests indicate to me JandC 200 would be only a little better than FP4 for maximum N+ developments. I am considering HP5 for lower contrast SBRs, but still only use FP4.

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